124 citations · 245 across the 5 of their papers we have counts for
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Nonlinear optical conductivity of a two-band crystal I
D. J. Passos, G. B. Ventura, J. M. B. Lopes dos Santos +1
The structure of the electronic nonlinear optical conductivity is elucidated in a detailed study of the time-reversal symmetric two-band model. The nonlinear conductivity is decomp…
Nonlinear optical responses of crystalline systems: Results from a velocity gauge analysis
D. J. Passos, G. B. Ventura, J. M. Viana Parente Lopes +2
In this work, the difficulties inherent to perturbative calculations in the velocity gauge are addressed. In particular, it is shown how calculations of nonlinear optical responses…
Gauge covariances and nonlinear optical responses
G. B. Ventura, D. J. Passos, J. M. B. Lopes dos Santos +2
The formalism of the reduced density matrix is pursued in both length and velocity gauges of the perturbation to the crystal Hamiltonian. The covariant derivative is introduced as…